i then want to access this property from a field convert function like below, however, this returns 'undefined' in the log. also when i hard code the property in the model, i am not able to access its value. Is there a way to do this? many thanks in advance for any suggestions

thanks sword-it for the suggestion. however the question was not so much about how can i put the property in the model, but rather how can i access it from the fields convert function? as i said also when i put the property hard coded into the model i am not able to access it form the fields convert function.